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Segment Information - Selected Financial Data (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Segment Reporting Information [Line Items]                      
Revenues                 $ 1,294,322 $ 1,258,294 $ 1,009,780
Depreciation and amortization                 140,316 122,569 97,350
Stock-based compensation expense                 29,602 36,763 20,360
Corporate and unallocated expenses                 (125,258) (104,718) (92,296)
Interest, net                 (45,002) (52,066) (30,388)
Other, net $ 5,245 $ 1,356 $ 2,041 $ (9,758) $ 3,399 $ (2,369) $ 1,402 $ (1,912) (1,116) 520 (3,724)
Income before income taxes $ 91,407 $ 22,540 $ 19,991 $ (35,312) $ 90,652 $ 36,950 $ (16,806) $ (38,586) 98,626 72,210 91,799
Operating Segments | ACI On Demand                      
Segment Reporting Information [Line Items]                      
Revenues                 769,180 678,960 433,025
Segment Adjusted EBITDA                 149,610 66,501 12,015
Depreciation and amortization                 40,594 34,395 31,541
Stock-based compensation expense                 8,852 7,995 4,338
Operating Segments | ACI On Premise                      
Segment Reporting Information [Line Items]                      
Revenues                 525,142 579,334 576,755
Segment Adjusted EBITDA                 290,310 321,305 323,902
Depreciation and amortization                 13,207 11,992 11,634
Stock-based compensation expense                 8,872 7,651 4,348
Corporate and other                      
Segment Reporting Information [Line Items]                      
Depreciation and amortization                 86,515 76,182 54,175
Stock-based compensation expense                 $ 11,878 $ 21,117 $ 11,674